2. Using firefox is not suggestable where their current versions has issues with compatability with new sites.
You can download Google Chrome by going Here

3. Make sure to login with EMAIL and not Username

4. To update Firefox go to the top right of the browser. You will see 3 lines .Click this option then go to "Help"
The bottom option will say About Firefox. Here is where you can update your browser.

5. To update Google Chrome go to the top right of the browser. You will see 3 dots. Click this option then go to "Help"
You will then see "About Google Chrome" this is where you can update your google chrome browser.